COHN, J. H. E. Five Diophantine Equations. Mathematica Scandinavica, Berkeley, CA, United States, v. 21, p. 61–70, 1967. DOI: 10.7146/math.scand.a-10845. Disponível em: https://journals.msp.org/mscand/article/view/2480. Acesso em: 25 jul. 2026.